Comedian Louis C.K. pulled in huge lines of fans when he announced a few surprise stand-up shows last Wednesday night at Carolines on Broadway. And the night owls who attended the standing-room-only late show were given an extra treat when veteran comic Chris Rock took the stage first for a 10-minute set that a source tells us included the jokes, “I’m voting for Obama because I’m black,” and that the new World Trade Center tower should be called the “ ‘I’m Never Going in That Building’ Building!”